code: def tearDown(self):
      ray.shutdown()
  
file_path: ray/rllib/tests/test_filters.py
imports: import numpy
  import unittest
  import ray
  from ray.rllib.utils.filter import RunningStat, MeanStdFilter
  from ray.rllib.utils import FilterManager
  from ray.rllib.tests.mock_worker import _MockWorkerSet
label_desc: Use image node_id 2 for calling the FilterManagerTest obj's underlying member method code with example usage: obj.tearDown() without return types